Leaflet is the leading open-source JavaScript library for mobile-friendly interactive maps.
Weighing just about 33 KB of JS,
it has all the mapping features most developers ever need.

Leaflet is designed with simplicity, performance and usability in mind.
It works efficiently across all major desktop and mobile platforms,
can be extended with lots of plugins,
has a beautiful, easy to use and well-documented API
and a simple, readable source code that is a joy to
contribute to.

Here we create a map in the 'map' div, add tiles of our choice, and then add a marker with some text in a popup:

Getting Involved

Let's create the best mapping library that will ever exist! Leaflet is developed by Vladimir Agafonkin of Mapbox with a team of dedicated contributors.
Pull requests are always welcome.
However, there are many more ways to get involved with the development of Leaflet.